Aang, because korra still has alot to learn in being the avatar. To be stronger she needs to learn everything from all her past lives as aang did and learn even more than his knowledge in order to defeat him in a fight or battle.

By the time se1 started, Korra already knew how to bend the 4 elements (cept Air), yet she seems to focus only on one per episode. Aang'll combo bend against Korra, while the writers forget she's the Avatar...

By the time se1 started, Korra already knew how to bend the 4 elements (cept Air), yet she seems to focus only on one per episode. Aang'll combo bend against Korra, while the writers forget she's the Avatar...